I just got a set of 285/65R18 BfGoodRich ALL Terrain Tires for my 2004 Ford F150 4x4..Ever since i put on the tires,,the Ride has Gotten Rough..Feel every little bump or Crack on the road..I am running 35 pounds of Air in the tires..Should i run around 32 pounds to make the Truck ride a little Smoother..

 

Part of the compromise of having tires with a sidewall as strong as the AT KO's is having a stiffer ride. 35 psi is on the low side for daily driving. I wouldn't go any lower.

 

ok thanks for reply..

 

A tire of that size should not be at 35 psi. Recommend tire pressure at 65, also that tire is a E range, 10 ply side wall, heavy duty tire - can handle 3640 lbs @ 80 psi per tire.

 

I run my 305's at 45psi.

 

305/65r18/e 3525lb @ 65 PSI, for daily driving a range of 45 to 55 is recommended, depending on your regional location.

285/65R18/e daily driving at 60-75 psi. but recommended 65 for optimial tire life.

 

The 285/65R18 are LR E with a max of 80. 50 psi would be right for an F150 for anything that the truck is rated for. 35 could be dangerous as you are at less than 50% of load capacity. Well below what the axle ratings is for the truck.
Higher than 50 is unnecessary unless you are towing something very heavy and want more side wall support. I have used 50 for LR E tires before and easily got over 40k out of the tires. If you feel you must go lower, do not go lower than 45. A TPMS set up would be set to go off at 46 for those tires, although you would usually find that LR as OE on a heavier truck.

The tire is rated at 3305lbs at 80. At 35, the tire would be rated at no more than 1600 lbs. Your axle rating is about 4000lbs, well above what 2 tires can handle at 35.

 

285/65r18E is 3640 @80 psi, thread depth at 16/32, 32.7 diameter, 8-10 rim range.

 

You are correct, I read the line above. Still though at 35, that is well below the axle rating.